Spark-plug.



C. L. BUNDY, DECD. w. BDHLEBER. Discuron.

' SPARK PLUG. 1,300,569. mimcmou FILED NOV. 2. ms. Patented p 9 9 2 SHEETS--SHEET z? i i 4 9 f 19 C. L. BUNDY, DEC'D.

W. BOHLEBER. EXECUTOR.

SPARK PLUG.

2 SHEETS-SHEET 2.

\llllll-llllllli 18 27 UNITED STATES PATENT OFFICE.

CYRUS L. BUNDY, 01: EAST ORANGE, NEW JERSEY, ASSIGNOR ONE-HALF TO WILLIAM BOHLEBER, OF NEW YORK, N. Y.; WILLIAM BOHLEBER EXECUTOR OF SAID CYRUS L. BUNDY, DECEASED.

SPARK-PLUG.

Specification of Letters Patent.

Patented Am. 15, 1919.

Application filed November 2, 1915. Serial No. 59,170.

Oran e, in the county of Essex and State of- New ersey, have invented certain new and useful Improvements in Spark-Plugs, of which the following is a full, clear, and exact description.

The invention which constitutes the subjeet matter of this application relates to a spark plug, and particularly to that type of plug which has a removable core.

Referring, to the drawings:

Figure 1 is a full sized side view of a spark plug showing one of the preferred embodiments of my invention.

F lg. 2 is a central vertical section showing the position of the parts when the core is held in operative ornoriual position.

Fig. 3 shows the position of the parts when the lock nut has been partially unscrewed from the bushing.

Fig. 4 shows a section taken on the line 4-4 of Fig. 1, the full and dotted lines illustrating the different angles at which the wrench handle may be inserted into the locknut.

Fig. 5 is a cross sectional view of another preferred embodiment of my invention.

Fig. (3 is a section taken on line 6-4; of Fig. 5.

Fig. T illustrates a detail employed with the modilicd form shown in Figs 5 and ('3, and equally capable of use with ale form of invention shown in Figs. 1 to 4 inclusive.

Fig. 9 shows a further n'iodification particularly designed to have the handle per: manently attached thereto.

Fig. 9 is a top plan view of form shown in Fig. 8.

Fig. 10 is a side view of a still further modification of the invention.

Fig. 11 is a top plan view of the modification shown in Fig. 10.

Referring first to'Figs. 1 to 4 inclusive, the reference numeral 10 designates the bushing, 11 the core or insulator, and 12 and 13 the electrodes of the spark plug all of which are of known construction except in the particulars hereafter mentioned.

The bushing 10 is provided with the usual shoulder 14 which corresponds with the shoulder 15 on the core 11. The bushing 10 15 also provided with an interior screwthread 16 adapted to receive the serewthreads 17 on the lock-nut 18, while the said lock-nut 18 is provided with a'pluralit-y of lateral perforations 19 to receive the bifurcations '20 of the handle or wrench 21. A metallic or other washer 22 may be provided, if desired, upon the up )er shoulder 23 of the core, and a suitable gasltet inay be interposed between the shoulder 1'4 on the bushing and the shoulder 15 on the core to effect t fluid tight connection at this point.

The operation, as regards Figs. 1, to 4 inclusive, is as follows: The bushing 10 is first set in the engine in the usual way as with other types of spark plugs. The core 11 is next inserted within the bushing and then the lock-nut 18 screwthreaded to the bushing 10, as shown in Fig. 3. 01' since the interior diameter of the bushing 18 is slightlv greater than the greatest diameter of eore,"it would be equally feasible to screwthread the lockout to the. bushing before the core is placed thereon. l-lowevcr this is a matter of taste. The bifurcation 20 of the handle 21 is then projected laterally through the 19. as shown, for instance, in t ie full lines of Fig. 4, it being of course understood that in the particular construct-ion shown the han- )erforations dle could be inserted from three other directions. as shown in dotted lines. The posi tion of the parts at this point is that clearly shown in Fig. 3. If the handle is now given in Fig. 3 the handle 21 is free to be withdrawn laterally from the perforations 19, but when in normal operative placed in any one of four positions (see Fig.

4) and should there be any obstructions preventing its complete rotation the handle may be moved as far as it will go, withdrawn from the lateral perforations, and moved backwardly to a succeeding position. In this way the handle may be given at least a quarter turn at each operation, and this operation repeated until the bifurcations 20 of the handle 21 engage with the top of the core .or the metallic washer placed thereon. After this engagement only a slight movement of the handleis required to efl'ect a fluid tight connection between the shoulders 14 and15. The upward pressure on the bifurcations by their engagement with the core causes said bifurcations to bind against the upper walls of the lateral perforations and the upper surface of the metallic washer 22, and the tighter the lock-nut is screwed down the tighter this binding engagement becomes. To remove the core it is onl necessary to reverse the handle slightly, say from one-thirty-second to one-eighth of a' turn,

' when the binding engagement referred to is broken and the iandle may be withdrawn laterally from the perforations 19 leaving the core free to be withdrawn from the bushing.

From the above illuill be seen that I have constructed a s ark plu core type whic not on y contains a small number of parts, but is cheap to manufacture and positive in o eration. The remov-' ability of the core no o'nly enablesthe englue to be primedthrough the spark plug, th

at also gives accessibility to the electrodes without the necessity of removing the bushing from the engine, the electrodes being carried by the core as shown. Another important advantage of my device resides in i the fact that should the porcelain core or other" electric insulator break or otherwise become useless a new core or insulator can be purchased without'the necessity of purchasing a new plug as an entirety.

One of the more important features of my invention-consists in providing aspark plug of this type with a means for moving the lock-nut downward by means of a step-bystep movement similar to the movement by between the latter means of a pawl and ratchet, at the same time causing an en agement of said means with the coretoe ect. a fluid tight union and the bushing. In other words. I employ means for imparting pressure of the bushing. In 62.

of the removable illustrate in 'ther modifications, and these I will now proceed to describe.

rotative impulses to said lock-nut said means also being adapted per end of the core to cfl'ect a uid tig t oint between the bushing and the core. This is desirable because, among other reasons, most gas engines, and especially those are (provided with methreaded. Interposed however between the bifurcations 20 of the handle and the up r shoulder of the core 11 is a grooved wasiie r 24, the roove 25 thereof (see Fig. 7) being defined y the upper and lower flanges 26 and 27, the former of which is of diameter than the latter and is pre erably adapted to rest upon the shoulder 28 of the lock-nut 18. By resting thewasher 24 upon the shoulder 28 the groove 25 is always in to enga' e tie u 66 -nut 18 difler from the 75 eater alinement with the perforations 19 of the lock-nut 18. The grooved washer may be cemented or other\ ise directly connected to the core and serves, not only as a bearing for the bifurcations 20, but also to exclude forei grooved washer 25 is equally adapted to be used in connection with the form of my invention shown in Figs. 1 to 4 inclusive.

The shown in Fig. 1 to 7 inclusive. However I igs. 8 to 11 inclusive two furmatter from the interior of the plug. 96 It Will be understood that the referred forms of my invention are 100 Referring to Figs. 8 and 9, the parts are 1 e same excepting the lock-nut 18" and handle 21". The former is a sleeve provided with a hex flan e 29 upon the upper end thereof. The handle has a substantially circular opening .30 from said circular opening. The handle is also provided with a stop 32 for limiting its movement in one direction and a turnover flange 33 for not only limitin its movement in t' lock-nut 18 in either direction. When in the position shown in Fig.9 then per portion of the'core lies between the sic es of the slot 26, the handle in this position bearing and a slot 31 radiating e other direction, but a so to turn the directly upon the upper shoulder of the core.

drawnthrough' said handle. It will there- 126 fore be seen that I have provided a laterally movable means secured to the lock-nut to rotate the same, which means comprises a handle havin an elongated openin therein through which the upper portion 0 the core projects. This elongated oiening is enlarged at one end to permit tie withdrawal of the core and is reduced at its other end so that the surrounding metal of the handle is adapted to engageand disengage with the upper shoulder of the core upon the rotation of the lock-nut.

In Figs. 10 and. 11 I illustrate a further modification, in which the lock-nut 18 is provided with arms or ears 34 which extend upwardly from the lock-nut and overhang the bifurcations 20 of the handle 21. The lock-nut in this instance is preferably hexagon shaped. The overhanging flan cs 35 constitute engaging surfaces for the ifurcations of the member 21. It will be understood that the bifurcated member is adapted to be moved laterally under said engaging surface, and is adapted to engage the core upon the rotation of said member'to effect a fluid tight joint between the core and bushing.

It is to be understood that I do not limit myself to the exact construction shown and described, as many changes can be obviously made in point of detail and other modifications resorted to without necessarily departing from the true spirit and scope of myinvention.

What I claim is: 1. In a spark plug, a bushing provided with a screw thread at its upper end and an annular shoulder at an intermediate point, a

removable core for said bushing provided.

with a shoulder normally resting upon the shoulder of .the bushing, and means for removably securing said core to the bushing, comprising a hollow lock nut through which the core may be inserted and withdrawn and provided with a plurality of lateral perforations therein, in combination with means provided with a portion adapted to pass laterally through said porforations and engage with said core fOllH0\- ing the lock nut downward to effect a lipid tight union between the core and bushing.

2. In a spark plug, a bushing provided with a screw thread at its upper end and an annular shoulder at an intermediate point, a removable core for said bushing provided with a shoulder normally restin upon the shoulder of the bushing, and means for the core may be inserted and withdrawn and provided with a plurality of lateral perforations therein, in combination with means adapted to be laterally inserted into .and

withdrawn from said perforations to impart a step-by-step movement to said lock nut, said means also adapted to engage said core for affecting a fluid tight union between the core and bushing and said engagement rendering the said means rigid with the plug.

3. In a spark plug, a bushing provided with ascrew thread at its upper end and an annular shoulder at an intermediate point, a removable core for said bushing provided with a shoulder normally resting upon the shoulder ofthe bushing,- and means for removably securing said core to the bushln comprising a hollow lock-nut through whic 1 the core may be inserted and withdrawn and provided with a plurality of lateral perforations therein, in combination with means, provided with a portion adapted to pass through said lateral perforations and engage with said core, for moving the lock-nut downward to effect a fluid tight union between the oore and bushing.

4. In a spark plug, a bushing provided with a screw thread at its upper end and an annular shoulder at an intermediate point, a removable'core for said bushing provided with a shoulder normally resting upon the shoulder of the bushing, and means for removably securing said core to the bushing, comprising 'a llOllQjW lock-nut through which the core may be inserted and withdrawn and provided with a plurality of lateral perforations there in in combination with means adapted to be inserted into and withdrawn laterally from said perforations to impart a step-by-step movement to said lock-nut, said means also adapted to engage said core for eflizcting a fluid tight union between the core and bushing and said engagement rendering the said means rigid with plug.

5. In a' spark-plug, a bushing provided with a screw thread at its upper end and an annular shoulder at an intermediate point, a removable core for said bushing provided with a shoulder normally resting upon the shoulder of the bushing. and a hollow locknut screw-threaded to said bushing through .which the core may be inserted and withdrawn and'prorided with lateral perforartionstherein, in combination with means for rotating said lock-nut and effecting a fluidtight joint between the core and bushing, comprising a removable member adapted to lie-inserted into and removed laterally from said perforations, said member adapted to engage and disengage said core upon the rotation thereof.

6. In a spark plug, a bushing provided with a screw thread at its upper end, a removable core for said bushing, a hollow lock-nut screw-threaded to the bushing and provided witlr a plurality of lateral per wfUl'ililUllS therein in combination with means for imparting; a step-by-step .rotative moveable 'core for sai a step-b tween the shoulders of ment to said lock-nut, and for effecting a fluid-tight joint between the core and bushing comprising a handle or wrench, one end of 'whic is adapted to pass through said perforations from a plurality of positions and engage with the core.

7. In a'spark plug, a bushing provided with a screw-thread at its 11 per end, a removable core for said busliing, a hollow lock-nut rovided with a screw thread engaging with the screw thread on the'bushmg and also provided with lateral perforations therein, in combination, with means da ted to impart a step=by-step impulse to said lock-nut to effect a fluid-tight joint between the core and bushin comprising a handle or wrench, one end 0 which is adapted to. ass through said. perforations from a plura ity of directions and engage with the core, the other end of said handle constituting means for rotating said lock-nut.

8. In a spark lug, 'a bushing a removbushin a hollow rotatable lock-nut screw threa ed to the bushing and provided with a plurality of lateral perforations therein, in combination wit a means for rotatin saidlock-nut to effect a fluid-tight connection between the core and bushing, com risin a handle, one end of which Is capa le 0 being inserted into and withdrawn from said perforations to effect step movement to said lock-nut and sai end also ada ted to engage with the core to effect sai fluid-tight connection.

9. In a spark plug,

a. bushing, a removable core for said bushing a: hollow rotatable lock-nut screw-threat ell to the bushing and provided with a plurality of lateral perforations therein, in combination with a member for imparting mtative impulses to said lock-nut, one end of said member adapted to pass through said perforations from a. plurality of directions and to engage the core, and the other end of whichconstitutes a handle or lever forimparting said impulses to efl'ect a fluid-tig t connection bethe .core and bushing 10.- In a spark plu a bushin a removable core for said bus in ble lock-nut screw-threacFed to the bushing and provided with a plurality of lateral perforations therein, in combination with a member for rotating said lock-nut, 'said member having a portion passing through said perforations and adapted to engage and core upon the rotation of said to effect a. fluid-tight connection between said core and bushing.

11. In a spark plu a bushi a removable eore.for-said bu in ,a'ho ow rotatable lock-nut screw-three ed to the bushing and provided with a plurality of lateral M.

. forations therein, in m'ember adapted to a. ho ow rotata-' member forations therein, in combination with a member for rotating said lock-nut, said member having a ortion adapted to pass through said lateral perforations and to engage with said core to effect a fluid-ti ht connection between said core and bush upon the rotation of said member, sai member normally adapted to be held rigidly to said lug by the upward pressure of the core am the downward pressure of the locknut thereon. r

12. In a spark plug, a bushing, a removable core for said bushing, a hollow rotatable lock-nut scrcwthreaded to the bushing, in combination with a member adapted to rotate the'same, said memberhaving a bifurcatedportion for straddling the upper portion of the core and adapted to on age with the core and lock-nut to effect a uidtight connection between said core and bushing upon the rotation of said member.

13. In a spark plug, a bushing, a removable core for said bushing, a hollow rotatable lock-nut screw-threaded to the bushing and provided with a plurality of lateral percomblnat-ion with a rotate the same, said member having a bifurcated portion which passes laterally through said perforations, and straddles andengages the upper portion of the core.

14, In a spark plug, a bushing, a removable core for said bushing, a hollow rotatable lock-nut screw-threaded to the bushing and provided with a plurality of lateral orforations therein, in combination wit a member adapted to impart rotative impulses to said lock-nut, said member havin a bifurcated portion adapted to enter said lateral perforations from a plurality of directions and to straddle and en age the upper. portion of the core, said mem ier also havin a handle or wrench portion connected to sai bifurcated portion.

15. In a spark plug, able core for saidbushin a hollow rotatable lock-nut screw-threa ed to the bushin and provided with a plurality of lateru perforations therein, in combination with a bushing, a removmeans for imparting rotative im ulscs to bushing, a hollow rota- .upper shoulder, a hollow rotatable lock-nut screw-threaded to the bushing and rovidcd means for imparting rotative impulses to said lodli-nut and to engage with the upper en d of said core to effect a fluid-tight oint between the core and bushin comprising a member havinga portion a apted to enter said lateral perforations from a-plurality of directions, and also having a portion which acts as a lever to effect said impulses.

17 In a spark plu a bushin a removable core for said bus iiing provi ed with an with a plurality of lateral per orations therein, a washer within said bushing provided with an annular groove and adapted to rest upon the upper shoulder on the core, in combination with a member for imparting rotative impulses to said lock-nut, said .v member having a portion adapted to pass through said lateral perforations and the groove from a plurality of directions.

18. In a spark plug, a bushing, a removable core for said bushing provided with a shoulder at the upper end thereof, a hollow rotatable lock-nut screw-threaded to the bushing and provided with a plurality of lateral perforations therein, in combination with a member for imparting rotative im pulses to said lock-nut to make a tight joint between the core and bushing, said member having a portion adapted to pass through said lateral perforations from a plurality of directions and engage with the upper shoulder of the core.

19. In a spark plug, the combination of a.

' relatively fixed member; an electrode carrying insulator adapted to removably seat therein; and an element rotatable about the longitudinal axis of the insulator and removable, by movement in a plane transverse to the axis of the insulator, and adapted' when rotated to apply pressure to the insulator in the direction of its axis to lock the insulator to its seat.

20. In a spark plug, the combination of a relatively fixed member; an electrode carrying insulator adapted to removably seat therein; and an element, provided with an operating handle by which said element rotated about the longitudinal axis of the insulator and may be removed by movement in a plane transverse to the axis of the insulator and adapted when rotated to apply pressure to the insulator in the direction of its axis to lock the insulator to its seat.

21. In a spark plug, the combination of v a relatively fixed member; an electrode carrymg insulator adapted to removably seat therein: and an element rotatable about the longitudinal axis of the insulator and removable by movement in a plane transverse to the axis of the insulator and extending over a portion of the insulator, said element said insulator to apply pressure to force it to its seat, provision being made whereby the distance of said bearing surface from said seat may be varied by the rotation of said clement.

In a spark plug, the combination of a relatively fixed lllPlllbxzl', an electrode carrying insulator adapted to removably seat therein and an element rotatable about the longitudinal axis of the insulator and fulcruming on a bearing surface and extending over a portion of the insulator, said element adapted to be rotated about said axis to apply pressure to said insulator to force it. to its seat, provision being made whereby the distance of said bearing sur-. face from said seat may be varied.

"24. In a spark plug, the combination of a relatively fixed member. an electrode carrying insulator adapted to removably seat therein, an element rotatable about the longitudinal axis of the insulator and removable by movement in a plane transverse to the axis of the insulator, and adapted \vhcn actuated to apply pressure to the insulator in the direction of its axis to lock the insulator to its seat, and an intermediate member transmitting pressure from said element to said insulator.

25. In a spark plug, the combination of a relatively fixed member, an electrode carry ing insulator adapted to removably seat therein, an element. rotatable about the longitudinal axis of the insulator and provided with an operating handle by which said element may be removed by movement in a plane transverse to the axis of the insulator and by which said element may be actuated so as to apply ressure to the insulator in the direction of its axis to lock the insulator to its seat, and an intermediate member transmitting pressure from said element to said insulator.

26. In a spark plug, the combination of a relatively fixed member, an electrode carrying insulator adapted to removably seat therein, an element, rotatable about the longitudinal axis of the insulator and removable by movement in a plane transversely to the axis of the insulator and extending over a portion of the insulator, said element being adapted when rotated to apply pressure to the insulator in thedirection of its axis to lock the insulator to its seat, and an intermediate member transmitting pressure from said element to said insulator.

27. In a spark plu the combination ofa relatively fixed mem er, an electrode carrying insulator adapted to removably seat therein, and provided with an u wardlyfacing shoulder, an element rotate le about the longitudinal axis of the insulator and 10 removable by movement in a plane trans verse to the axis of the insulator and adapted to be actuated to apply pressure to the insulator in the direction of its axis to lock it to its seat, and an intermediate member acting on saidshoulder off the insulator and transmitting pressure thereto from said element.

In testimony whereof I affix my 'signaturne.

CYRUS L. BUNDY'.. 

